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| Number | Title | Issue Date |
| 7623317 | Magnetic disk device and magnetic recording medium A magnetic disk device has a magnetic recording medium in which one servo track and an array of at least one data track are formed alternately. A head portion includes a set of reading heads arranged in a radius direction of the magnetic recording medium for reading... | 11/24/2009 |
| 7430092 | Control apparatus, storage apparatus, and computer product Offtrack amounts corresponding to every servo in which data writing has been completed is stored in a storage unit. Offtrack amount corresponding to a next servo frame, which is a servo frame present next to a servo frame for which data has been written, is calculat... | 09/30/2008 |
| 7382564 | Acquiring spiral servo information on a storage surface Various embodiments of the present invention are generally directed to processing servo data on a storage surface by detecting a time difference between consecutive read signal envelopes from spiral servo information on the surface. ... | 06/03/2008 |
| 7365932 | Disk drive comprising an optical sensor for vibration mode compensation A disk drive is disclosed comprising an actuator arm, a head attached to a distal end of the actuator arm, a voice coil motor for rotating the actuator arm about a pivot, and an optical sensor operable to generate a first position signal representing a position of t... | 04/29/2008 |
| 7355808 | Method and apparatus for partial self-servo writing using servo wedge propagation A method and apparatus for partial self-servo writing a disk surface in a disk drive using servo wedge propagation is provided. In one embodiment, servo information is written by a servo track writer near an outer diameter of the disk surface. The servo information ... | 04/08/2008 |
| 7283320 | Magnetic recording medium including servo and data bands in the magnetic layer A magnetic recording medium having a magnetic layer containing magnetic powder provided on a support is disclosed. The magnetic layer possesses a servo band in which a servo signal for controlling tracking of a magnetic head, and a data band on which a data is recor... | 10/16/2007 |
| 7230786 | Method and apparatus for dynamic placement of an integration window in a disk drive having a disk surface with spiral servo information written thereon The present invention is directed to a method and apparatus for dynamic placement of an integration window in a disk drive having a disk surface with spiral servo information written thereon. A read head is provided for reading the spiral servo information and gener... | 06/12/2007 |
| 7230789 | Method and apparatus for performing a self-servo write operation in a disk drive using spiral servo information The present invention is directed to a method and apparatus for performing a self-servo write operation in a disk drive. In one embodiment, the disk drive includes a disk surface having a read head and a write head associated therewith. Spiral servo information is w... | 06/12/2007 |
| 7212372 | Magnetic tape and magnetic tape cartridge There is provided a magnetic tape, to be used at a running speed of at least 4,000 mm/sec., wherein servo signals for controlling tracking are recorded on the magnetic layer or the backcoat layer, and wherein the difference between the recording track width and the ... | 05/01/2007 |
| 7209314 | Disk drive with phase-quadrature servo pattern and demodulated position error signal insensitive to timing and phase-misalignment errors A magnetic recording disk drive uses a phase-quadrature position-error-signal (PES) pattern and a servo signal demodulator that is insensitive to clock errors and phase-misalignment errors. The disk has angularly-spaced servo sectors, with each servo sector having r... | 04/24/2007 |
| 7203023 | Magnetic recording unit and magnetic recording medium The present invention provides a magnetic recording unit, including: a magnetic head; a magnetic recording medium having a servo pattern for adjusting a position of the magnetic head; a frequency detecting element for detecting a frequency in the servo pattern on a ... | 04/10/2007 |
| 7187142 | Motor drive with velocity noise filter A drive unit for controlling a motor includes a position feedback device and a velocity noise filter. The position feedback device is operable to generate a position signal relating to a position of the motor. The velocity noise filter is coupled to the position fee... | 03/06/2007 |
| 7149048 | Method and apparatus for improving spiral-based position correction system stability via kernel frequency component modification The present invention is directed to a method and apparatus for improving spiral-based position correction system stability via kernel frequency component modification. In one embodiment, a disk drive includes a disk surface with servo information written thereon, w... | 12/12/2006 |
| 7136253 | Method and apparatus for providing multi-point position demodulation of a read head when using spiral-written servo information The present invention is directed to a method and apparatus for providing multi-point position demodulation of a read head when using spiral-written servo information. In one embodiment, a disk surface has spiral servo information written thereon. A read head genera... | 11/14/2006 |
| 7135859 | Rotary and angular position sensing A device monitors angular position. The device includes a media platter and a magneto-resistance sensor. The media platter includes a track of data encoded on a surface of the media platter. The magneto-resistance sensor is located adjacent to the media platter and ... | 11/14/2006 |
| 7133231 | Method and apparatus for recording data on hard disk drive, and storage medium therefor A method of and an apparatus for recording data on a hard disk drive, and a storage medium containing a program for executing the method. Data is recorded on a track in a recording region and an address of a next track to be recorded with the data is determined so t... | 11/07/2006 |
| 7126780 | Method, system, and article of manufacture for self-servowriting a disk A compound actuator self-servo writes a hard disk. The compound actuator moves to track n+1. A first head on the compound actuator track follows on track n. The other heads servo write on track n+2. One of the other heads track follow on track n. The first head serv... | 10/24/2006 |
| 7109670 | Motor drive with velocity-second compensation An apparatus for use with a signal generator and a motor controller includes a velocity compensator, an adjustor, and a velocity regulator. The signal generator provides a reference velocity signal, and the motor controller receives an output signal and uses the out... | 09/19/2006 |
| 7106549 | Magnetic recording and reproducing apparatus and magnetic recording medium A magnetic recording and reproducing apparatus extracts a record signal from a sum signal (ADD) of signals detected via first and second magnetic detection regions (RH1, RH2) that are formed to be offset in the lengthwise (TL) and widthwise ... | 09/12/2006 |
| 7072131 | Water marking in a data interval gap A storage device in which file data is divided into multiple blocks for storage on a recording medium. The storage device includes an additional data storing section for storing additional data to be recorded on the recording medium in association with the data to b... | 07/04/2006 |
| 7054096 | Method and apparatus for determining embedded runout correction values A method and apparatus for compensating for non-linearities due to pivot bearing friction when determining embedded runout correction values during partial self-servo write of a disk drive is disclosed. In one embodiment, the disk drive includes a disk surface havin... | 05/30/2006 |
| 7050260 | Method and apparatus for partial self-servo writing using servo wedge propagation A method and apparatus for partial self-servo writing a disk surface in a disk drive using servo wedge propagation is provided. In one embodiment, servo information is written by a servo track writer near an outer diameter of the disk surface. The servo information ... | 05/23/2006 |
| 7050259 | High precision servo track writing with position error signal feedback A servo writer system for a disk drive uses the reader element of a magnetic transducer head in the disk drive to read head position information during servo writing of the disk drive. A positioning system in the servo writer uses both the head position information ... | 05/23/2006 |
| 7019937 | Method and apparatus for determining a transducer's reference position in a disk drive having a disk surface with spiral servo information written thereon The present invention is directed to method and apparatus for determining a transducer's reference position in a disk drive having a disk surface with spiral servo information written thereon. The transducer comprises a read head for reading spiral servo information... | 03/28/2006 |
| 7009805 | Detection of track misregistration within user data channel A method for computing position error signal information of a transducer in a data storage system provides for different readback signals between adjacent tracks. The method involves a computation to obtain coarse position information from the servo bursts signals f... | 03/07/2006 |
| 6995943 | Off-track error recovery method and apparatus for disk drive An off-track error recovery method and apparatus for a disk drive are disclosed herein. Off-track errors are either due to vibration of the disk drive or due to defective servo data stored on a disk surface of the disk drive. In order to tailor error recovery operat... | 02/07/2006 |
| 6992857 | Weighting servo signals for head positioning In one embodiment, a servo positioning method includes deriving a first servo signal S1 from a first servo band, deriving a second servo signal S2 from a second servo band, defining a head element reference between the servo bands, weighting ea... | 01/31/2006 |
| 6963467 | Method and apparatus for compensating for media shift due to tape guide A method and apparatus for compensating for media shift due to spiral groove roller tape guide is disclosed. The lateral tape shift is measured. Then the control of the coarse actuator is adjusted for the lateral tape shift so that the movement of the coarse actuato... | 11/08/2005 |
| 6950262 | Flexible disk drive control method capable of preventing a seek error from occurring In a flexible disk drive for driving a flexible disk inserted in the flexible disk drive, when a power supply is turned on and when the flexible disk is not inserted in the flexible disk drive, a seek operation is inhibited and a track 00 signal is supplied to a hos... | 09/27/2005 |
| 6947245 | Incorporating repeatable run-out during self-writing of servo patterns in a rotatable media data storage device Methods in accordance with the present invention can be applied to reduce frictional effects in a bearing of a rotary actuator on the motion dynamics of the rotary actuator. In one such method a disk having a first magnetic servo pattern on a surface written, for ex... | 09/20/2005 |
| 6943974 | Storage device, program for controlling storage device, method for controlling storage device and recording medium A method and system for rewriting data on a tape when an error occurs during an initial write operation. When the initial write error occurs, the data is rewritten at a location that is a pre-defined block gap distance from the last valid write location on the tape.... | 09/13/2005 |
| 6760186 | Disk drive having first-written servo wedge marked and method for forming marked servo wedges A disk drive having a marker for identifying the transition between the first and last written servo wedges on a servo track. The marker indicates the likely position where closure error may occur during the operation of the hard disk drive. The marker is used by th... | 07/06/2004 |
| 6608731 | Dynamic reduction of track shape errors in disc drives The invention eliminates relative and absolute track shape errors by writing zero acceleration path (ZAP) correction factors into the servo sectors during track propagation. A servo track guide zone is written to the disc. ZAP correction factors are writt... | 08/19/2003 |
| 6204990 | Circuit and method for determining the position of a read head for a magnetic disk drive device A servo-demodulator for a pair of alternating signals generated by a magnetic disc read head and indicative of the position of the read head in relation to the center of a recorded track. The servo-demodulator comprises a peak detector for successively an... | 03/20/2001 |
| 6122134 | Combined longitudinal and transversal tracking An information storage medium has at least a longitudinal bundle comprising three servo tracks (3, 4, 5). The bundle is arranged in consecutive tracking units (T(N)) of a determined longitudinal length. Surfaces of said servo tracks present either a first... | 09/19/2000 |
| 6057977 | Compact servo pattern optimized for M-R heads A disk drive system has a servo pattern with bursts that are recorded without multiple passes per burst and without trimming, so that the servo pattern bursts have the same width as the data tracks. The servo write steps occur in partial data track pitch ... | 05/02/2000 |
| 6046879 | Weighted linearization of a position error signal in a disc drive Apparatus and method for providing a linearized position error signal in a disc drive. A first servo position error signal is generated by the disc drive as a selected combination of servo burst signals received as a disc drive head passes over servo burs... | 04/04/2000 |
| 6028731 | Method and system for providing servo signals to a magnetic head positioning system of disk drive A method and system for developing continuous position control signals for continuously repositioning a data head relative to an addressed data track on a rotating magnetic disk. The method includes the steps of formatting the disk with a unique servo pat... | 02/22/2000 |
| 6002542 | Magnetic disc read head positioning device and method A servo-demodulator for a pair of alternating signals generated by a magnetic disc read head and indicative of the position of the read head in relation to the center of a recorded track. The servo-demodulator comprises a peak detector for successively an... | 12/14/1999 |
| 5903411 | Method for reliably positioning a head in a disk drive to a guard band area A storage device includes a predetermined number of disks on which servo information is recorded, and a predetermined number of heads. The heads are positioned on target cylinders on the basis of the servo information read from the disks through the heads... | 05/11/1999 |
